I'd buy it, except for one problem. It's Antec.
I've lost too many mobo to Antec's poor build quality. I understand this one is from Delta, but even then... Power supply is something worth spending money on. I only buy Seasonic.

This one doesn't have enough amps to crossfire two OC'd 7870's anyway, meh.

Yeah rail amperage is pretty confusing stuff. I still dont fully understand it. However, this unit has 4 +12V rails each putting out 40A each(going by manufacturer specs) which is enough to power a small space ship.